When using RADIUS as system user-auth backend this does not apply to the console-server which uses dropbear for the SSH to RS232 mapping.
- `/sbin/radius_shell` was not listed as an allowed shell (https://github.com/vyos/libpam-radius-auth/commit/78c476caf1cafa134e079563b8d0455d004021f0)
- `dropbear` returns: `Feb 14 14:56:15 vyos dropbear[4844]: User account 'username' is locked`